Question

Are the points A (3, 6, 9), B (10, 20, 30) and C (25, – 41, 5), the vertices
of a right angled triangle?

Answer 1

And this has to be done mentally?!

Answer 2

yes

Answer 3

I'm at a loss :D

Answer 4

Find the vectors from one point to another point, and see if two of the vectors have a dot product of zero?

Answer 5

I suppose so...

Answer 6

@agent0smith your procedure seems easy :)

Answer 7

You just need AB, AC and CB and then check the dot products AB.AC, AB.CB, CB.AC

Answer 8

Thank you sir